地铁隧道电缆阴燃时优化通风的数值模拟

Numerical Simulation on the Optimization of the Ventilation Mode in Subway Tunnel Cable Smoldering Fire

地铁隧道电缆阴燃火灾相比明燃火灾,具有更高的隐蔽性和更大的危害性。根据地铁隧道电缆的阴燃特点,采用数值模拟方法,对阴燃电缆热解产物在不同通风模式下的毒害性分布进行研究。结果表明,隧道断面2 m/s的送风风速并不能最大程度地确保疏散人员的安全,而与列车驶入时刻满足三次多项式关系的最优送风风速,可以使列车内安全距离达到最大,且不会影响到人员的安全疏散。

Compared with the subway tunnel cable fire,the cable smoldering fire is of higher concealment and greater danger. On the basis of the characteristics of the cable smoldering fire,this paper uses the numerical method to conduct research on the toxic distribution of the pyrolysis products of the smoldering cable in different ventilation modes. Results show that a supply of 2 m / s air velocity to the tunnel cross-section cannot ensure the safety of the evacuees to a maximum extent. However,the optimal supply of the air velocity which meets the cubic polynomial relationship upon the arrival of the train can maximize the safe distance inside the train and will not affect the safety evacuation of the personnel.